fix copies (huggingface#12637)

* fix

* remoce cocpies instead

Author: yiyixuxu

src/diffusers/models/transformers/transformer_sana_video.py

@@ -172,7 +172,6 @@ def apply_rotary_emb(
         return hidden_states
 
 
-# Copied from diffusers.models.transformers.transformer_wan.WanRotaryPosEmbed
 class WanRotaryPosEmbed(nn.Module):
     def __init__(
         self,